The Classic has a custom setting that I can use and set the charged voltage manually. I plan to only charge the bank to 49.2 volts (4.1 volts per cell). I'll also be disabling the equalizing function and temperature compensation (which shouldn't be an issue anyway, as my basement holds a pretty stable 65 F) to prevent over-charging. I can safely go to 50.4 volts, but operating voltage range of the pack is 42-49.2 volts (3.5-4.1 V/cell).
The modules each have a BMS board on them that appear to function on their own. I have a lithium balance charger that I'll use to make sure all the modules are balanced and at the same charge level. Given that they came out of relatively new packs, they should already be balanced (especially if they're all from the same pack). I may end up using the "Garcia Bros. BMS"
, given my voltage range and relatively low current draw.
The Outback's charger uses grid power to charge the battery bank. That's not the goal of this system. Ideally, this system is off-grid, but if it does end up needing a grid connection to be reliable, then I'll need to figure out which method allows for the following:
1. Runs independently on battery/solar power.
2. Automatically connects to grid to support loads when batteries deplete. Automatically disconnects when batteries are charged.
3. Grid does not charge the batteries.
4. Automatically connects to grid to sell excess solar power when batteries are full. Automatically disconnects when excess is no longer available.
As a bonus feature, I'd like to give the system control of interior lighting circuits for dusk to dawn operation for the pair of lamps that we leave on all night.